Sony MDR10RNC Premium Noise Canceling Headphone Dual noise sensors provide up to 99.4% noise cancellation. Precision-engineered for wide frequency response (6-24Hz). Comfortable ear pads with swivel design.Connectivity Technology: Wired 20-hour music playback from one AAA battery. Can be used as standard headphones without battery. 2 supplied cords: normal and in-line mic/remote. Free SmartKey App for custom in-line remote function. Handy travel case and in-flight adaptor supplied.